Blind fix for flashing lockscreen/bouncer

It looks like the swipe up to show bouncer is being immediately
canceled. Since the values can overlap, don't start the transition
to bouncer until it is >0f and <1f.

Fixes: 365700803
Test: manual - drag up for bouncer
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: Icae6a140b21ffb4c4a5c7025044f570973c5be97